First deploy on game VMs cannot decrypt SSH host keys

[Lucas Desgouilles]

• Add a passworded age key in repo
• Rekey host keys with it as recipient
• Update the key command to use it (also use self)
  

  i69-servers/wireguard.nix

  Line 58 in da5e198

   keyCommand = [ "age" "-i" "/home/ldesgoui/.ssh/id_ed25519" "-d" "ssh/host-${name}.age" ];